You didn't mention whose sliders you downloaded and I know many are broken or outdated. I would suggest using Luumia's sliders. I know they are current and he has very easy instructions on how to use them.
Height/Neck/Hips https://luumiasims.com/post/174867678324/a-definitive-cas-height-slider-plus-moremore
Ears/Face/Hands/Fingers: https://luumiasims.com/post/174006296684/the-sims-as-a-franchise-might-be-headed-toward-a